Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 545 · 40 questions

The trick (Chain the factors): Split the multiplier into two small factors: 12 = 3 × 4, 14 = 2 × 7, 15 = 3 × 5, 16 = 4 × 4, 18 = 2 × 9, 24 = 4 × 6. Multiply by the first factor. Multiply that answer by the second factor (× 4 is double, double).

1. 1.20 × 24 =
2. 2.38 × 15 =
3. 3.19 × 18 =
4. 4.27 × 15 =
5. 5.20 × 18 =
6. 6.25 × 24 =
7. 7.37 × 16 =
8. 8.35 × 24 =
9. 9.26 × 24 =
10. 10.29 × 15 =
11. 11.48 × 14 =
12. 12.19 × 24 =
13. 13.31 × 14 =
14. 14.38 × 24 =
15. 15.42 × 18 =
16. 16.28 × 24 =
17. 17.25 × 14 =
18. 18.17 × 24 =
19. 19.49 × 18 =
20. 20.27 × 14 =
21. 21.11 × 15 =
22. 22.21 × 12 =
23. 23.34 × 15 =
24. 24.26 × 14 =
25. 25.28 × 18 =
26. 26.38 × 18 =
27. 27.42 × 24 =
28. 28.16 × 16 =
29. 29.20 × 14 =
30. 30.15 × 12 =
31. 31.15 × 18 =
32. 32.17 × 15 =
33. 33.13 × 14 =
34. 34.18 × 12 =
35. 35.33 × 12 =
36. 36.24 × 12 =
37. 37.30 × 15 =
38. 38.37 × 12 =
39. 39.49 × 16 =
40. 40.28 × 16 =

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